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someplace I read hat on some of these newer machines we need to hold the bobbin so it gets into the tension slot , which we can not see . while bringing the bobbin thread up thru the needle hole . I did try it and it is simple to do . just leave the bobbin cover off till you get ready to sew .

I would start by looking for a problem with the bobbin tension. Do you have the bobbin threaded through the case correctly? Is the the bobbin tension set to loose? Another thing that can cause it to spool up on the bottom is if it sews a bunch of stitches all in the same spot or real close, do you have the presser foot tension to loose?

You can find Singer bobbin winding instructions at http://www.singerco.com/resources/bobbin_wind.html.
"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.

It sounds like you don't have any tension on the thread when winding the bobbin. Make sure that you are running the thread through the tension disc on the top of the machine before going to the bobbin winder.

Sad to say you might have to do an indept check. Like start with a small peice of fabric - start with the highest bobbin tension and go to the lowest - leaving the top tension the same. Write all the findings. Then do it all again with the next top tension. Keep your 'good' findings in a little notepad in your sewing box. Then you will have it all ready for any other project. Good luck!

"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.